I have learned the Ethereum yellow paper. In the 4th page of the paper, you can find the following statements:
The function, L_s of sigma is defined as p of a, and the function is used to provide a short identity. I wonder whether if L_s is a function which outputs some value (a hash) or a set of tuples of p(a) like in the picture?
What is the collapse function? And how do I understand the function L_s?